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		#1 | 
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			 Connoisseur 
			
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				I Downloaded The Latest Edition of Calibre And I Can't Get It Open (MacBook)
			 
			
			
			I don't know what happened. I downloaded the new version of Calibre but it can't open. Is anyone else facing this issue? 
		
	
		
		
		
		
		
		
		
		
		
		
		
			UPDATE: NEVER MIND I GOT IT TO WORK I USED AN ALTERNATE LINK TO RE-DOWNLOAD THIS ANOTHER UPDATE: IT GOT SHUT DOWN AND WHEN I TRIED TO OPEN IT IT COULDN'T WORK Last edited by MrSlow&Steady; 10-17-2020 at 02:05 AM.  | 
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		#2 | 
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			Uh I hate to bump this but it's not working again. Like it shut down for some reason and every time I try to bring it back up it isn't working
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#3 | 
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			 creator of calibre 
			
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			what does doesnt work mean? the process doesnt run? is it in activity monitor? is there a crash report?
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#4 | 
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		#5 | 
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			 Custom User Title 
			
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			Did you check whatever the Mac version of the Task Manager is to make sure it isn't stuck running in the background? Calibre only lets you run one instance at a time.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#6 | |
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		 Quote: 
	
 Like I clicked on the icon, it briefly appears, and when it fails to open as per usual, it disappears from the Activity Monitor.  | 
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		#7 | 
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			 Resident Curmudgeon 
			
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			Disable your AV and try again. If that causes Calibre to work, then you'll need to uninstall whatever AV you run.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#8 | 
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			 creator of calibre 
			
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			Open Terminal.app and run its as 
		
	
		
		
		
		
		
		
		
		
		
		
	
	/Applications/calibre.app/Contents/MacOS/calibre-debug -g and post the output  | 
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		#9 | 
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		#10 | |
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		 Quote: 
	
 There'll be an update addressing this glitch right? EDIT: But this is only 5.2 though. It didn't work for 5.3 Last edited by MrSlow&Steady; 10-18-2020 at 02:57 PM.  | 
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		#11 | 
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		#12 | 
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		#13 | 
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		#14 | 
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			 Bibliophagist 
			
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			This may not be your problem but when I updated my Mac VM to 10.15.7, for some reason, the Security and Privacy preference switched the Allow Apps downloaded from: to App Store from App Store and Identified Developers. Switching back to App Store and Identified Developers allowed me to run the updated calibre install after clicking on Open in the dialog that popped up.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#15 | 
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			@kovidgoyal (FYI)  
		
	
		
		
		
		
		
		
		
		
		
		
	
	I had a similar issues with a Macbook and an iMac MacOS 10.15.7 + Calibre 5.* I reverted to Calibre 4.23 and it fix the problem. The problem: Calibre not opening after update but opening later after 2 - 3 attempts. Once opened it reopened okay but failed to open when I clicked on an epub or awz file. It would start to open and then stop (close)  | 
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